Fundamentals of sol-gel dip-coating

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Abstract
During the process of dip-coating, the substrate is withdrawn from the sol at a constant rate. After several seconds, the process becomes steady. The entrained film thins by evaporation of solvent and gravitational draining. Because the shape of the depositing film remains constant with respect to the reservoir surface, it is possible to use analytical methods such as ellipsometry and fluorescence spectroscopy to characterize the depositing film in situ. The microstructure and properties of the film depend on the size and structure of the inorganic sol species, the magnitude of the capillary pressure exerted during drying, and the relative rates of condensation and drying. By controlling these parameters, it is possible to vary the porosity of the film over a wide range

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